Document
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ADC574A
FPO
Microprocessor-Compatible ANALOG-TO-DIGITAL CONVERTER
FEATURES
q COMPLETE 12-BIT A/D CONVERTER WITH REFERENCE, CLOCK, AND 8-, 12-, or 16BIT MICROPROCESSOR BUS INTERFACE q IMPROVED PERFORMANCE SECOND SOURCE FOR 574A-TYPE A/D CONVERTERS Conversion Time: 25µs max Bus Access Time: 150ns max AO Input: Bus Contention During Read Operation Eliminated q DUAL IN-LINE PLASTIC, PLCC AND HERMETIC CERAMIC q FULLY SPECIFIED FOR OPERATION ON ±12V OR ±15V SUPPLIES q NO MISSING CODES OVER TEMPERATURE: 0°C to +75°C: ADC574AJ and K Grades –55°C to +125°C: ADC574ASH, TH for freedom from latch-up and for optimum AC performance. It is complete with a self-contained +10V reference, internal clock, digital interface for microprocessor control, and three-state outputs. The reference circuit, containing a buried zener, is lasertrimmed for minimum temperature coefficient. The clock oscillator is current-controlled for excellent stability over temperature. Full-scale and offset errors may be externally trimmed to zero. Internal scaling resistors are provided for the selection of analog input signal ranges of 0V to +10V, 0V to +20V, ±5V, and ±10V. The converter may be externally programmed to provide 8- or 12-bit resolution. The conversion time for 12 bits is factory set for 25µs maximum. Output data are available in a parallel format from TTLcompatible three-state output buffers. Output data are coded in straight binary for unipolar input signals and bipolar offset binary for bipolar input signals. The ADC574A, available in both industrial and military temperature ranges, requires supply voltages of +5V and ±12V or ±15V. It is packaged in a 28-pin plastic DIP, and a hermetic side-brazed ceramic DIP.
DESCRIPTION
The ADC574A is a 12-bit successive approximation analog-to-digital converter, utilizing state-of-the-art CMOS and laser-trimmed bipolar die custom-designed
Control Inputs
Control Logic Status
Bipolar Offset 20V Range
Clock Successive Approximation Register Three-State Buffers
10V Range Reference Input Reference Output Comparator 12-Bit D/A Converter 10V Reference
Parallel Data Output
International Airport Industrial Park • Mailing Address: PO Box 11400 Tel: (520) 746-1111 • Twx: 910-952-1111 • Cable: BBRCORP •
• Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd. • Tucson, AZ 85706 Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
© 1984 Burr-Brown Corporation
PDS-550G
Printed in U.S.A., August, 1993
SPECIFICATIONS
ELECTRICAL
At TA = +25°C, VCC = +12V or +15V, VEE = –12V or –15V, and VLOGIC = +5V unless otherwise specified. ADC574AJP, JH, SH PARAMETER RESOLUTION INPUTS ANALOG Voltage Ranges: Unipolar Bipolar Impedance: 0 to +10V, ±5V ±10V, 0V to +20V DIGITAL (CE, CS, R/C, AO, 12/8) Over Temperature Range Voltages: Logic 1 Logic 0 Current Capacitance TRANSFER CHARACTERISTICS ACCURACY At +25°C Linearity Error Unipolar Offset Error (Adjustable to Zero) Bipolar Offset Error (Adjustable to Zero) Full-Scale Calibration Error(1) (Adjustable to Zero) No Missing Codes Resolution (Diff. Linearity) Inherent Quantization Error TMIN to TMAX Linearity Error: J, K Grades S, T Grades Full-Scale Calibration Error Without Initial Adjustment(1): J, K Grades S, T Grades Adjusted to Zero at +25°C: J, K Grades S, T Grades No Missing Codes Resolution (Diff. Linearity) TEMPERATURE COEFFICIENTS (TMIN to TMAX)(3) Unipolar Offset: J, K Grades S, T Grades Max Change: All Grades Bipolar Offset: All Grades Max Change: J, K Grades S, T Grades Full-Scale Calibration: J, K Grades S, T Grades Max Change: J, K Grades S, T Grades POWER SUPPLY SENSITIVITY Change in Full-Scale Calibration +13.5V < VCC < +16.5V or +11.4V < VCC < + 12.6V –16.5V < VEE < –13.5V or –12.6V < VEE < – 11.4V +4.5V < VLOGIC < +5.5V CONVERSION TIME (4) 8-Bit Cycle 12-Bit Cycle OUTPUTS DIGITAL (DB11–DB0, STATUS) (Over Temperature Range) Output Codes: Unipolar Bipolar Logic Levels: Logic 0 (ISINK = 1.6mA) Logic 1 (ISOURCE = 500µA) Leakage, Data Bits Only, High -Z State Capacitance 10 15 13 20 0 to +10, 0 to +20 ±5, ±10 5 10 * * * * V V kΩ kΩ MIN TYP MAX 12 MIN ADC574AKP, KH, TH TYP MAX * UNITS Bits
4.7 9.4
5.3 10.6
* *
* *
+2 –0.5 –5
0.1 5
+5.5 +0.8 +5
* * *
* *
* * *
V V µA pF
±1 ±2 ±10 ±0.25 11 ±1/2 ±1 ±1 ±0.47 ±0.75 ±0.22 ±0.5 11 ±10 ±5 ±2 ±10 ±2 ±4 ±45 ±50 ±9 ±20 12 12 *
±1/2 * ±4 *
LSB LSB LSB % of FS(2) Bits LSB LSB LSB % of FS % of FS % of FS % of FS Bits ppm/°C ppm/°C LSB ppm/°C LSB LSB ppm/°C ppm/°C LSB LSB
±1/2 ±3/4 ±0.37 ±0.5 ±0.12 ±0.25
±5 ±2.5 ±1 ±5 ±1 ±2 ±25 ±25 ±5 ±10
±2 ±2 ±1/2 17 25 * * * •
±1 ±1 * * •
LSB LSB LSB µs µs
+2.4 –5
0.1 5
Unipolar Straight Binary (USB) Bipolar Offset Binary (BOB) +0.4 * +5 *
* * * *
V V µA pF
®
ADC574A
2
SPECIFICATIONS
ELECTRICAL
(CONT)
At TA = +25°C, VCC = +12V or +15V, VEE = –12V or –15V, and VLOGIC = +5V unless otherwise specified. ADC574AJP, JH, SH PARAMETERS INTERNAL REFERENCE VOLTAGE Voltage Source Current Available for External Loads(5) POWER SUPPLY RE.